Free BMI Calculator – Determine Your Body Mass Index Instantly

BMI, or Body Mass Index, is a measure that uses your height and weight to estimate body fat. It's important because it helps assess whether you're underweight, normal weight, overweight, or obese, which can be indicators of potential health risks.

BMI is calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²). For example, if you weigh 70 kg and are 1.75 meters tall, your BMI is 70 / (1.75 x 1.75) = 22.86.

The World Health Organization defines BMI categories as follows: Underweight (BMI < 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These categories help assess potential health risks associated with body weight.

While BMI is a useful screening tool, it doesn't account for factors like muscle mass, bone density, and overall body composition. Therefore, it's best used in conjunction with other assessments for a comprehensive health evaluation.

BMI can be used for individuals aged 2 to 19, but interpretations differ from adults. For children and teens, BMI percentiles based on age and sex are used to assess growth patterns and potential health risks.

Simply enter your height and weight into the provided fields and click 'Calculate'. The tool will instantly display your BMI and indicate your weight category based on standard classifications.